On Sun, Apr 30, 2023 at 11:13 PM Andrew Pinski via Gcc-patches <gcc-patches@gcc.gnu.org> wrote: > > This ports the clrsb builtin part of builtin_zero_pattern > to match.pd. A simple pattern to port. > > OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. > > gcc/ChangeLog: > > * match.pd (a != 0 ? CLRSB(a) : CST -> CLRSB(a)): New > pattern. > --- > gcc/match.pd | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/gcc/match.pd b/gcc/match.pd > index 0e782cde71d..bf918ba70ce 100644 > --- a/gcc/match.pd > +++ b/gcc/match.pd > @@ -7787,6 +7787,14 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) > (cond (ne @0 integer_zerop@1) (func@4 (convert? @2)) integer_zerop@3) > @4)) > > +/* a != 0 ? FUN(a) : CST -> Fun(a) for some CLRSB builtins > + where CST is precision-1. */ > +(for func (CLRSB) > + (simplify > + (cond (ne @0 integer_zerop@1) (func@5 (convert?@4 @2)) INTEGER_CST@3)
As you don't seem to use @2 why not match (func@5 @4) only? Otherwise LGTM. > + (if (wi::to_widest (@3) == TYPE_PRECISION (TREE_TYPE (@4)) - 1) > + @5))) > + > #if GIMPLE > /* a != 0 ? CLZ(a) : CST -> .CLZ(a) where CST is the result of the internal > function for 0. */ > (for func (CLZ) > -- > 2.31.1 >
